| 摘要 |
A universal roller unit for a treadmill having a supporting frame and a platform. The supporting frame includes a front and a rear bar at the bottom thereof. A roller is pivotally connected to both ends of the front bar. A universal roller unit is attached to the middle part of the rear bar. When the treadmill is in a flat operational position, the universal roller unit may be attached to the side wall of the rear bar; when the treadmill is in a folded storage position, the universal roller unit may be pushed outwards to allow the universal roller to contact with the ground so that the universal roller and the rollers take the responsibility of supporting the whole weight of the treadmill and move the treadmill stably and freely in any direction.
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